Question 2: Should usability test participants ‘think Aloud’
or should they report their experience after the task is completed?

“Both Technique reveal comparable sets of Usability
Problems. Participants worked more slowly when thinking aloud, suggesting that
when task time is an issue, alternatives such as retrospective reposts should
be used.”

Questions 3: How does having a facilitator present affect
usability test performance?

Answer: Information search in the laboratory and on the web:
with and without experimenter – schtle – Mecklenbeck, M., & Huber, O. 2003.

“Users spend about twice as long and clicked three times as
many links when facilitator is present. Facilitated testing environments may
result in artificially diligent attempts at completing a task relative to
non-facilitated tests.”

Question 4: Which is the best method for testing mobile
application: Laboratory or field testing